Oracle 1Z0-171

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Oracle 1Z0-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. What is a subquery in SQL?

A) A query used for joining two or more tables
B) A query inside another query
C) A query that combines data from multiple tables
D) A query used to create a table

2. What does the following SQL query do?
SELECT *
FROM employees e
JOIN employees m ON e.manager_id = m.employee_id;

A) Lists employees who are managers
B) Lists employees who are not managers
C) Lists employees and their corresponding managers
D) Lists employees without departments

3. Which type of join retrieves only the rows with matching values in both tables?

A) NATURAL JOIN
B) OUTER JOIN
C) CROSS JOIN
D) INNER JOIN

4. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) RIGHT
B) LEFT
C) FULL OUTER JOIN
D) CROSS

5. How are NULL values treated in relational databases?

A) NULL values are treated as empty strings.
B) NULL values are not allowed in relational databases.
C) NULL values are treated as zero.
D) NULL values represent missing or unknown data.

Solutions: